Potato Late Blight

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Both potatoes and tomatoes can quickly be defoliated by Phytophthora infestans, an oomycete active in wet cool conditions. In North Carolina disease damage occurs from June through the end of the season.

Potato late blight image by Howard F. Schwartz --bugwood

Potato late blight
image by Howard F. Schwartz –bugwood

Management Strategies:

  • Grow varieties known to be resistant to Potato late blight
  • Use disease free seed potatoes
  • Plant early to avoid disease
  • Limit leaf wetness (water the soil, not the leaves, use drip irrigation, space plants to allow air circulations)
  • Remove and discard infected plants

More information and images.

If you're a North Carolina resident with a question about a topic on this site, your local N.C. Cooperative Extension office can help.

Contact your local county center.

Written By

Lucy Bradley, N.C. Cooperative ExtensionDr. Lucy BradleyUrban Horticulture Professor and Extension Specialist Call Dr. Lucy E-mail Dr. Lucy Horticultural Science
NC State Extension, NC State University
Updated on Nov 10, 2020
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